Ok I can't give a comment on a turbo car, however been running an ITG Panel on my R32 for a year then changed to an induction kit Neuspeed one.
The ITG in the standard air box was much much better, revved more freely, with the Neuspeed it feels as if the cars holding back a bit until mid range.
I am now thinking of going back to the panel or maybe the new forge kit, which is enclosed in its own air box.